Artificial tooth.



L. E. EVSLIN. ARTIFICIAL TOOTH. nrmpumu rmm oomn mo.

, 1,031 Patented July'2, 1912.

- by soldering.

inner side of the backing and to the UNITED sTATEs Paras l OFFlCE.

LEO n. EVSLIN, 01? NEW YORK, N. Y.

ARTIFICIAL TOOTH.

- Specification of Letters Patent.

a I Patented July 2, 1912.

Application filed October 17, 1910. Serial No. 587,458.

To allavhom 'itmay concern:

Belt known that I, LEO E. EVSLIN, residing at New York, in the countyand State of New York, have invented certain new and useful Improvementsin Artificial Teeth, of which the following is a specification. p

This invention relates to artificial teeth, particularly of the sortknown as interchangeable or replaceable teeth. I have heretoforedevisedand patented certain improvements in this class'of artificial teeth,characterized by the factthat pins are provided, which are adapted to befirmly engagedjwithartificial teeth which are provided with cavitiescorrespondingly shaped ing thereinwhich is adapted to be engaged overthe projecting end of the pin, so that when the proper relation of thebacking to the tooth has been determined, the backing may be permanentlySecured to the pin as Much diflicult has been experienced with teeth ofthe kin described, in the firstplace because the fixing of the relationbetween pin and tooth was not positively and easily accomplished, andthe attachment between pin and tooth not so strong as desirable; and inthe second place because in soldering the backing to the end of the pinprojecting through it, it' frequently happened that particles of solderfound their way to the shank so that when the latter was subinto thecavity of the likelihood of splitting of the pin, sequently introducedtooth, there would be the porcelain.

I provide an artificial tooth and appur: tenant devices whosepractical'use is free from the objections above noted, and whichattaindesirable results other than those above noted as the aim of mypresent invention. I

The invention accordingly consists in the features of construction,combinations of elements and arrangements of parts, which areexemplified in.the construction hereinafter described, and the scopeof'the application of which will beaindicated in the following claim.

- Figure 1 IS a rear. elevation of a tooth,

showing the opening of the pin cavity. and

the counter-sunkseatsurrounding the same and indicating indotted linesthat part of the cavity which extends within the depth pids of thetooth; Fig 2 is a central vertical section taken at right'angles to theview shown in Fig. 1 and with the pin and backing-inf place; Fig. 3 is arear elevation of Fig. 2;; Fig. 4 is a perspective of one of the at};

taching pins, shown also in Fig. 2; Fig. 5 1s a collective view'mperspective of several different forms of boxings which are-adapt-f edto be inserted in, and which give shape to tooth cavities; Fig. 6 is an'elevation of a backing such as Imay apply; Fig. 7 is a view similar toFig. 1, but showing a'tooth provided with a differently disposed scat;Fig. 8 is *a viewsimilar to Fig. 2, ofthe subject-matter of F ig. 7 Fig.9 is a view' similar to Fig. 3', of a tooth like t-hat shown in Fig. 7,to which has been attached a pin like that shown in Fig. 1.0, with whichno;

operates a backing' such as shown in Fig. 5

12; Fig. 10 is a perspective of a'form of pin adapted to be used inconnection with the tooth shown in Fig- 7.. Fig. 11 is a perspective ofanother formof pin adapted for use in connection with the tooth shown inof backing which is adapted for use with the pin shown in Fig. 10. v i

ings, 1 indicates an artificial tooth of pol: celain, or the like, whichis provided with a; cavity 2, running in the case of bicuspids andmolars toward the'bu'ccal cusp, the case of the six anterior teethrunning toward the cuttin edge of the tooth. This cavity is prefera lysomewhatconstricted toward its inner end, in the case of bicusand molarstoward the'lingual surface or cus 7, and in the'case of anterior teethto ward the labial surface. The shape of the cavityis defined by aboxing 3,- which may be of platinum, that is baked in the tooth at thetime of manufacture. Aside frjom the fact that I prefer to have thehoxin tap'ered at one end, as shown in Fig. 5, t ecr'osjs sectionthereof may b Ivaried at will, ex-; cept that for obvious {reasons Iprefer that its cross-section shall hfother than circular, for instance,rectangi arpsqua're, elliptical, (-ruciform,"etc. The oxing 3 does notex tend flush with the outer surface of the tooth surroumliug the cavitywhich it defines, but

there-is provided a counter-sunk seat 4, surrounding the opening of thecavity. This: seat may extend'on all sides of the cavity opening. or ontwo opposite sides thereof, or otherwise. pin 5 is provided having jFig. 7; and Fig. 12 1s an elevationof a form shankshapedfappropriatelyto the cavity in the tooth,fand adatpted to be inserted thereshould.also into. That is to say, the shank may be of any desiredcross-section, to'correspond with various cavities already referred to,and,

preferably have a tapered end 6-, corresponding with thef taperedportion of the cavity.- "At the other end of the shank provided an"integral lateral projection 7, Q

a thickness so that when the pin isp0 sitloned'asshown'in Figs. -2 and8, said lateral projection will-fit snugly within its. cor;

respondingly shaped counter-sunk seat 4 in? the tooth, and the outersurface of the lateral projection will be flush with the rear 10 and 11it takes the form of the horizontal bar-in a T. These are merelyillustrations,

. and the only requisite is that the lateral projection must correspond,with the countersunk seat in' the tooth surface. Obviously,

;if-'the seat; and the projectionare other than circular, there canbe-no relativelateral movement..." I prefer also that the projeclike"that shown in Fig- '4' has been intro-.

'tion ,shall reasons which will .30. I

the pin,

be in the nature ofa collar, for

presently appear.

. Extending beyond the lateral projection 7 is an attaching portion 8,whose cross-section' is immaterial. In Fig. 4:. I

show the attaching portion 8 alined with the shank of the pin, also inFig. 11; and in Fig. 10 there are two members 8, one at each end ofthe'lateral projection 7. "When a pin duced into a correspondinglyshaped cavity of a tooth, as in Fig. 2, and the member 7 seated upon theseat 4, the attaching portion 8 of the pin will project beyond thesurface of the tooth. A perforated backing such as shown in Fig, 6 isnow placedover'the projecting part 80f the pin, and when the backing hasi been permanently secured to the part 8 it becomes a permanent backingto which may be secured in the ordinary way any tooth, which is providedwith a cavity that isshaped in correspondence with the inner end of thepin. In soldering the back ing on to the part 8, the collar 7 preventsthe passage of solder to the shank, as will be obvious. Where such a pinis used as is shown in Fig. 10, of course, with. a tooth having acorrespondingly arranged seat 5, the backing will have to be providedwith two perforations, as seen in Fig. 12. this case access of solder tothe shank is revented'because the shankis out-of while the provision ofnoanaaa ment with the attaching portions 8. 'Where a pin 11 used the]danger of entrance of solder to the shank is minimized, although it isnot enti1-elyelin1i11ated as in the-case oi among others, andwhich,while easier of practical application, and -resulting in a very strongand durable structure,j-is yet very economical to manufacture, lfor itwill be evident that the counter-sunk seat may be provided in the toothas part of the operation of providing the cavity proper;

on the pin is a very simple matter, and involves but little additionalmaterial.

As many changes could .be made in! the. above construction and manyapparently widely different embodiments of tion could be made withoutdepartingfrom the scope thereof, it. is intended that all mattercontained in the above description or shown in the accompanying drawingshall be interpreted as illustrative land not in a limiting sense. It isalso. to be understood that the language used in the follow ing claim isintended to cover all of the generic and specific features of theinvention the lateral projections this invenherein described and allstatementsof the scopeof the invention, which as a matter of language,might be sai d to fall therebetween.

Having thus described my invention what lclaim as new and desire tosecureby Letters Patentis:..-

In a device of-the kind described, in combination, a tooth having acavity therein {whose cross-section is nowhere greaterthan at its mouth,there being, a countersunk seat formed in the tooth surface about thecavity bpening, the perimeter of said :seat being other than circular, apin snugly'fittingm said cavity and having a collar intermediate itsends, said collar exactly fitting said seat and having its outer surfaceflush with theadjacent surface of the tooth "when in "place upon theseat, and a perforated backihgem. gaged over the outer end of the pinbeyond the collar, said backing contacting with the Hush surfaces of thetooth and collar.

In testimony-whereof I havehereun'to arfixed myysignature in thepresence of two witnesses. 1

LEO EQEVSLIN. v

' Witnesses

